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windows-nt/Source/XPSP1/NT/sdktools/masm/asmemit.c

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2020-09-26 03:20:57 -05:00
/* asmemit.c -- microsoft 80x86 assembler
**
** microsoft (r) macro assembler
** copyright (c) microsoft corp 1986. all rights reserved
**
** randy nevin
**
** 10/90 - Quick conversion to 32 bit by Jeff Spencer
*/
#include <stdio.h>
#include <io.h>
#include <string.h>
#include "asm86.h"
#include "asmfcn.h"
#define LINBUFSIZE EMITBUFSIZE - 20 /* line # records can't as big */
#define OMFBYTE(c) *ebufpos++ = (unsigned char)(c)
#define FIXBYTE(c) *efixpos++ = (unsigned char)(c)
#define LINBYTE(c) *elinpos++ = (unsigned char)(c)
#define EBUFOPEN(c) (ebufpos+(c) <= emitbuf+EMITBUFSIZE)
#define EFIXOPEN(c) (efixpos+(c) < efixbuffer+EMITBUFSIZE)
#define ELINOPEN(c) (elinpos+(c) <= elinbuffer+LINBUFSIZE)
UCHAR emitbuf[EMITBUFSIZE];
UCHAR efixbuffer[EMITBUFSIZE];
UCHAR elinbuffer[LINBUFSIZE];
UCHAR *ebufpos = emitbuf;
UCHAR *efixpos = efixbuffer;
UCHAR *elinpos = elinbuffer;
UCHAR ehoffset = 0; /* number of bytes into segment index */
UCHAR emitrecordtype = 0;
OFFSET ecuroffset;
USHORT ecursegment;
long oOMFCur;
SHORT FixupOp = 0;
SHORT LedataOp = 0xA0;
USHORT linSegment;
UCHAR fLineUsed32;
SHORT fUnderScore;
UCHAR fIniter = TRUE;
UCHAR fNoMap; /* hack to disable fixup mapping for CV */
extern PFPOSTRUCT pFpoHead;
extern PFPOSTRUCT pFpoTail;
extern unsigned long numFpoRecords;
VOID CODESIZE edump( VOID );
VOID PASCAL CODESIZE emitoffset( OFFSET, SHORT );
/* The calls to the routines in this module appear in the following group
order. Ordering within a group is unspecified:
Group 1:
emodule (Pname)
Group 2:
emitsymbol (Psymb)
Group 3:
emitsegment (Psymb)
emitglobal (Psymb)
emitextern (Psymb)
Group 4:
emitcbyte (BYTE)
emitobject(pDSC)
emitcword (WORD)
emitdup (???)
Group 5:
emitdone (Psymb)
*/
/*** emitsword - feed a word into the buffer
*
* emitsword (w);
*
* Entry w = word to feed into omf buffer
* Exit word placed in buffer low byte first
* Returns none
*/
VOID PASCAL CODESIZE
emitsword (
USHORT w
){
OMFBYTE(w);
OMFBYTE(w >> 8);
}
/* emitoff - write an offset, either 16 or 32 bits, depending upon
* use32. note conditional compilation trick with sizeof(OFFSET).
* with more cleverness, this could be a macro. -Hans */
VOID PASCAL CODESIZE
emitoffset(
OFFSET off,
SHORT use32
){
emitsword((USHORT)off);
if (sizeof(OFFSET) > 2 && use32)
emitsword((USHORT)highWord(off));
}
/*** emitSymbol - output name string
*
* Entry
* pSY - pointer to symbol table entry to dump
*/
VOID PASCAL CODESIZE
emitSymbol(
SYMBOL FARSYM *pSY
){
if (pSY->attr & M_CDECL)
fUnderScore++;
if (pSY->lcnamp)
emitname ((NAME FAR *)pSY->lcnamp);
else
emitname (pSY->nampnt);
}
/*** emitname - write FAR name preceeded by length into omf buffer
*
* emitname (name);
*
* Entry name = FAR pointer to name string
* Exit length of name followed by name written to omf buffer
* Returns none
*/
VOID PASCAL CODESIZE
emitname (
NAME FAR *nam
){
char FAR *p;
OMFBYTE(STRFLEN ((char FAR *)nam->id)+fUnderScore);
if (fUnderScore) { /* leading _ for C language */
fUnderScore = 0;
OMFBYTE('_');
}
for (p = (char FAR *)nam->id; *p; p++)
OMFBYTE(*p);
}
/*** flushbuffer - write out linker record
*
* flushbuffer ();
*
* Entry ebufpos = next address in emitbuf
* emitbuf = data buffer
* emitrecordtype = type of omf data in buffer
* ehoffset = length of segment index data in buffer
* Exit data written to obj->fil if data in buffer
* buffer set empty (ebufpos = emitbuf)
* segment index length set to 0
* Returns none
*/
VOID PASCAL CODESIZE
flushbuffer ()
{
/* Don't put out an empty data record, but can do empty
* anything else */
if ((emitrecordtype&~1) != 0xA0 ||
(ebufpos - emitbuf) != ehoffset) /* RN */
ebuffer (emitrecordtype, ebufpos, emitbuf);
ebufpos = emitbuf;
ehoffset = 0;
}
/*** flushfixup, flushline, write out fixup/line record
*
* flushfixup ();
*
* Entry efixbuffer = fixup buffer
* efixpos = address of next byte in fixup buffer
* Exit fixup buffer written to file if not empty
* fixup buffer set empty (efixpos = efixbuffer)
* Returns none
*/
VOID PASCAL CODESIZE
flushfixup ()
{
ebuffer (FixupOp, efixpos, efixbuffer);
FixupOp = 0;
efixpos = efixbuffer;
}
VOID PASCAL CODESIZE
flushline ()
{
USHORT recordT;
recordT = emitrecordtype;
ebuffer ( (USHORT)(fLineUsed32? 0x95: 0x94), elinpos, elinbuffer);
elinpos = elinbuffer;
emitrecordtype = (unsigned char)recordT;
}
/*** emitsetrecordtype - set record type and flush buffers if necessary
*
* emitsetrecordtype (t);
*
* Entry t = type of omf record
* Exit emit and fixup buffers flushed if t != current record type
* segment index written to buffer if data or dup omf record
* emit segment set to current segment
* emit offset set to offset within current segment
* Returns none
*/
VOID PASCAL CODESIZE
emitsetrecordtype (
UCHAR t
){
if (emitrecordtype && emitrecordtype != t) {
/* flush emit and fixup buffers if active and not of same type */
flushbuffer ();
flushfixup ();
switch(t)
{
case 0xA0:
case 0xA1: /* LEDATA or */
case 0xA2: /* LIDATA (dup) record */
case 0xA3:
if (pcsegment) {
/* create a new header */
ecursegment = pcsegment->symu.segmnt.segIndex;
ecuroffset = pcoffset;
emitsindex (pcsegment->symu.segmnt.segIndex);
/* if we are getting to the end of the buffer
* and its a 32 bit segment, we need to start
* using 32 bit offsets in the LEDATA header.
* -Hans */
if (wordsize == 4)
{
if (t>= 0xA2)
t = 0xA3;
/* there is a bug in the current linker--
* all ledata or lidata records within
* a module have to be either 16 or 32.
* comment out optimization until this
* is fixed */
else /* if (pcoffset>0x0ffffL-EMITBUFSIZE) */
LedataOp = t = 0xA1;
}
emitoffset((OFFSET)pcoffset, (SHORT)(t&1));
if (t&1)
ehoffset += 2; /* RN */
break;
}
else
errorc (E_ENS);
default:
break;
}
}
if (t == 0xA4) {
t = 0xA1;
}
emitrecordtype = t;
}
/*** emitsindex - output 'index' of segment, external, etc.
*
* emitsindex (i);
*
* Entry i = index
* Exit index written to emit buffer
* ehoffset = 3 if single byte index
* ehoffset = 4 if double byte index
* Returns none
*/
VOID PASCAL CODESIZE
emitsindex (
register USHORT i
){
ehoffset = 3;
if (i >= 0x80) {
OMFBYTE((i >> 8) + 0x80);
ehoffset++;
}
OMFBYTE(i);
}
/*** emodule - output module name record
*
* emodule (pmodule);
*
* Entry pmodule = pointer to module name
* Exit module name written to obj->fil
* current emit segment and offset set to 0
* Returns none
*/
VOID PASCAL CODESIZE
emodule (
NAME FAR *pmodule
){
char FAR *p;
emitsetrecordtype (0x80);
emitname (pmodule);
flushbuffer ();
if (fDosSeg) {
emitsetrecordtype (0x88);
emitsword((USHORT)(0x9E00 | 0x80)); /* nopurge + class = DOSSEG */
flushbuffer ();
}
if (codeview == CVSYMBOLS){
/* output speical comment record to handle symbol section */
emitsetrecordtype (0x88);
OMFBYTE(0);
emitsword(0x1a1);
emitsword('V'<< 8 | 'C');
flushbuffer ();
}
while (pLib) {
emitsetrecordtype (0x88);
emitsword((USHORT) (0x9F00 | 0x80)); /* nopurge + class = Library*/
for (p = (char FAR *)pLib->text; *p; p++)
OMFBYTE(*p);
flushbuffer ();
pLib = pLib->strnext;
}
ecuroffset = 0; /* initial for pass2 */
ecursegment = 0;
}
/*** emitlname - put symbols into bufer to form 'lnames' record
*
* emitlname (psym);
*
* Entry psym = pointer to symbol structure
* Exit current record type set to LNAMES and buffer flushed if
* necessary. The name string is written to the emit buffer.
* Returns none
*/
VOID PASCAL CODESIZE
emitlname (
SYMBOL FARSYM *psym
){
emitsetrecordtype (0x96);
if (lnameIndex == 3) /* 1st time around */
OMFBYTE(0); /* output the NULL name */
if (!EBUFOPEN(STRFLEN (psym->nampnt->id) + 1)) {
flushbuffer ();
emitsetrecordtype (0x96);
}
emitSymbol(psym);
}
/*** emitsegment - output a segment definition record
*
* emitsegment (pseg);
*
* Entry pseg = pointer to segment name
* Exit record type set to SEGDEF and emit buffer flushed if necessary.
* SEGDEF record written to emit buffer
* Returns none
*/
VOID PASCAL CODESIZE
emitsegment (
SYMBOL FARSYM *pseg
){
UCHAR comb;
UCHAR algn;
SHORT use32=0;
/* use32 is whether to put out 16 or 32 bit offsets. it
* only works if segmnt.use32 is enabled. the D bit
* is keyed off segmnt.use32 -Hans */
if (sizeof(OFFSET)>2 &&
(pseg->symu.segmnt.use32 > 2) &&
pseg->symu.segmnt.seglen > 0xffffL)
use32 = 1;
emitsetrecordtype ((UCHAR)(0x98+use32)); /* SEGDEF */
algn = pseg->symu.segmnt.align;
comb = pseg->symu.segmnt.combine;
#ifdef V386
if (!use32 && pseg->symu.segmnt.seglen == 0x10000L) /* add 'big' bit? */
if (pseg->symu.segmnt.use32 > 2)
OMFBYTE((algn<<5) + (comb<<2) + 3); /* add 'D' bit */
else
OMFBYTE((algn<<5) + (comb<<2) + 2);
else
#endif
if (pseg->symu.segmnt.use32 > 2)
OMFBYTE((algn<<5) + (comb<<2) + 1); /* add 'D' bit */
else
OMFBYTE((algn<<5) + (comb<<2));
if (algn == 0 || algn == (UCHAR)-1) {
/* segment number of seg */
emitsword ((USHORT)pseg->symu.segmnt.locate);
OMFBYTE(0);
}
emitoffset(pseg->symu.segmnt.seglen, use32);
emitsindex (pseg->symu.segmnt.lnameIndex);
pseg->symu.segmnt.segIndex = segmentnum++;
/* seg, class number */
if (!pseg->symu.segmnt.classptr) /* Use blank name */
emitsindex (1);
else
emitsindex((USHORT)((pseg->symu.segmnt.classptr->symkind == SEGMENT) ?
pseg->symu.segmnt.classptr->symu.segmnt.lnameIndex:
pseg->symu.segmnt.classptr->symu.ext.extIndex));
emitsindex (1);
flushbuffer ();
}
/*** emitgroup - output a group record
*
* emitgroup (pgrp);
*
* Entry pgrp = pointer to group name
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitgroup (
SYMBOL FARSYM *pgrp
){
SYMBOL FARSYM *pseg;
emitsetrecordtype (0x9A);
emitsindex (pgrp->symu.grupe.groupIndex);
pgrp->symu.grupe.groupIndex = groupnum++;
pseg = pgrp->symu.grupe.segptr;
while (pseg) {
if (pseg->symu.segmnt.segIndex){
OMFBYTE(((pseg->attr == XTERN)? 0xFE: 0xFF));
emitsindex (pseg->symu.segmnt.segIndex);
}
pseg = pseg->symu.segmnt.nxtseg;
}
flushbuffer ();
}
/*** emitglobal - output a global declaration
*
* emitglobal (pglob);
*
* Entry pglob = pointer to global name
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitglobal (
SYMBOL FARSYM *pglob
){
static SHORT gIndexCur = -1, sIndexCur = -1;
register SHORT gIndex, sIndex, cbNeeded;
OFFSET pubvalue;
SHORT use32 = 0x90;
pubvalue = pglob->offset;
if ((unsigned long)pubvalue >= 0x10000l)
use32 = 0x91;
/* A public EQU can be negative, so must adjust value */
/* this is happening because masm keeps numbers
* in 17/33 bit sign magnitude representation */
if ((pglob->symkind == EQU) && pglob->symu.equ.equrec.expr.esign)
pubvalue = (short)(((use32==0x91? 0xffffffffl : 65535) - pglob->offset) + 1);
/* Match Intel action, If a global is code, it should
belong to the group of the CS assume at the time of
definition, if there is one */
/* Output group index for data labels too */
sIndex = gIndex = 0;
if (((1 << pglob->symkind) & (M_PROC | M_CLABEL))
&& pglob->symu.clabel.csassume
&& pglob->symu.clabel.csassume->symkind == GROUP
&& pglob->symsegptr && pglob->symsegptr->symu.segmnt.grouptr)
gIndex = pglob->symu.clabel.csassume->symu.grupe.groupIndex;
if (pglob->symsegptr)
sIndex = pglob->symsegptr->symu.segmnt.segIndex;
cbNeeded = STRFLEN ((char FAR *)pglob->nampnt->id) + 13;
if (gIndex != gIndexCur ||
sIndex != sIndexCur ||
emitrecordtype != use32 ||
!EBUFOPEN(cbNeeded)) { /* start a new record */
flushbuffer();
emitsetrecordtype ((UCHAR)use32);
gIndexCur = gIndex;
sIndexCur = sIndex;
emitsindex (gIndexCur);
emitsindex (sIndexCur);
if (sIndex == 0) /* absolutes require a 0 frame # */
emitsword (sIndex);
}
emitSymbol(pglob);
emitoffset(pubvalue, (SHORT)(use32&1));
if (codeview == CVSYMBOLS) {
if (pglob->symkind == EQU) /* type not stored */
emitsindex(typeFet(pglob->symtype));
else
emitsindex (pglob->symu.clabel.type);
}
else
emitsindex(0); /* untyped */
}
/*** emitextern - emit an external
*
* emitextern (psym)
*
* Entry *psym = symbol entry for external
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitextern (
SYMBOL FARSYM *psym
){
USHORT recType;
recType = 0x8c;
if (psym->symkind == EQU){
/* this an extrn lab:abs definition, which is allocated as
* an EQU record which doesn't have space for a index so
* it stored in the unused length field */
psym->length = externnum++;
}
else {
psym->symu.ext.extIndex = externnum++;
if (psym->symu.ext.commFlag)
recType = 0xb0;
}
fKillPass1 |= pass2;
emitsetrecordtype ((UCHAR)recType);
if (!EBUFOPEN(STRFLEN (psym->nampnt->id) + 9)) {
flushbuffer ();
emitsetrecordtype ((UCHAR)recType);
}
emitSymbol(psym);
if (codeview == CVSYMBOLS)
emitsindex(typeFet(psym->symtype));
else
OMFBYTE(0);
if (recType == 0xb0) { /* output commdef variate */
if (psym->symu.ext.commFlag == 1) { /* near item */
OMFBYTE(0x62);
/* size of field */
OMFBYTE(0x81);
emitsword((USHORT)(psym->symu.ext.length * psym->symtype));
}
else {
OMFBYTE(0x61); /* far item */
OMFBYTE(0x84); /* # of elements */
emitsword((USHORT)psym->symu.ext.length);
OMFBYTE(psym->symu.ext.length >> 16);
OMFBYTE(0x81); /* element size */
emitsword(psym->symtype);
}
}
}
/*** emitfltfix - emit fixup for floating point
*
* emitfltfix (group, extidx);
*
* Entry
* *extidx = external id (0 if not assigned)
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitfltfix (
USHORT group,
USHORT item,
USHORT *extidx
){
register SHORT i;
if (*extidx == 0) {
/* Must define it */
if (!moduleflag)
dumpname ();
/* All fixups are FxyRQQ */
*extidx = externnum++;
if (!EBUFOPEN(7))
flushbuffer ();
emitsetrecordtype (0x8C);
/* Name length */
OMFBYTE(6);
OMFBYTE('F');
OMFBYTE(group); /* Group I or J */
OMFBYTE(item); /* Item D, W, E, C, S, A */
OMFBYTE('R');
OMFBYTE('Q');
OMFBYTE('Q');
OMFBYTE(0);
}
if (pass2) { /* Must put out a extern ref */
if (!EFIXOPEN(5))
emitdumpdata ( (UCHAR)LedataOp);
emitsetrecordtype ( (UCHAR) LedataOp);
FixupOp = 0x9C + (LedataOp & 1);
/* output location */
i = (SHORT)(ebufpos - emitbuf - ehoffset);
FIXBYTE(0xC4 + (i >> 8));
FIXBYTE(i);
FIXBYTE(0x46);
if (*extidx >= 0x80) /* Output 2 byte link # */
FIXBYTE ((UCHAR)((*extidx >> 8) + 0x80));
FIXBYTE(*extidx);
}
}
/*** emitline - output a line number offset pair
*
* emitline(pcOffset)
*
* Entry pcoffset: code offset to output
* src->line: for the current line number
* Exit none
*/
VOID PASCAL CODESIZE
emitline()
{
static UCHAR fCurrent32;
if (codeview < CVLINE || !pass2 || !objing || !pcsegment)
return;
if (macrolevel == 0 ||
!fPutFirstOp) {
fCurrent32 = (emitrecordtype == 0xA1);
if (linSegment != pcsegment->symu.segmnt.segIndex ||
! ELINOPEN(2 + wordsize) ||
fLineUsed32 != fCurrent32 ) {
flushline();
/* Start a new line # segment */
linSegment = pcsegment->symu.segmnt.segIndex;
fLineUsed32 = fCurrent32;
/* start record with group index and segment index */
LINBYTE(0); /* no group */
if (linSegment >= 0x80) /* Output 2 byte link # */
LINBYTE ((UCHAR)((linSegment >> 8) + 0x80));
LINBYTE(linSegment);
}
LINBYTE(pFCBCur->line); /* First line # */
LINBYTE(pFCBCur->line >> 8);
LINBYTE(pcoffset); /* then offset */
LINBYTE(pcoffset >> 8);
if (fLineUsed32) { /* 32 bit offset for large segments */
LINBYTE(highWord(pcoffset));
LINBYTE(highWord(pcoffset) >> 8);
}
}
if (macrolevel != 0)
fPutFirstOp = TRUE;
}
/*** fixroom - check for space in fix buffer
*
* flag = fixroom (n);
*
* Entry n = number of bytes to insert in buffer
* Exit none
* Returns TRUE if n bytes will fit in buffer
* FALSE if n bytes will not fit in buffer
*/
UCHAR PASCAL CODESIZE
fixroom (
register UCHAR n
){
return (EFIXOPEN(n));
}
/*** emitcleanq - check for buffer cleaning
*
* flag = emitcleanq (n);
*
* Entry n = number of bytes to insert in buffer
* Exit E_ENS error message issued if pcsegment is null
* Returns TRUE if
*/
UCHAR PASCAL CODESIZE
emitcleanq (
UCHAR n
){
if (!pcsegment)
errorc (E_ENS);
else
return (ecursegment != pcsegment->symu.segmnt.segIndex ||
pcoffset != ecuroffset ||
!EBUFOPEN(n));
}
/*** emitdumpdata - clean data buffer and set up for data record
*
* emitdumpdata (recordnum);
*
* Entry recordnum = record type
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitdumpdata (
UCHAR recordnum
){
flushbuffer ();
/* force dump of buffer */
emitrecordtype = 0xFF;
emitsetrecordtype (recordnum);
}
/*** emitcbyte - emit constant byte into segment
*
* emitcbyte (b)
*
* Entry b = byte
* pcsegment = pointer to segment symbol entry
* pcoffset = offset into segment
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitcbyte (
UCHAR b
){
/* if the segment is changed or the offset is not current or there
is no room in the buffer then flush buffer and start over */
if (emitcleanq (1))
emitdumpdata ((UCHAR)LedataOp);
emitsetrecordtype ((UCHAR)LedataOp);
OMFBYTE(b);
ecuroffset++;
}
/*** emitcword - place a constant word into data record
*
* emitcword (w);
*
* Entry w = word
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitcword (
OFFSET w
){
if (emitcleanq (2))
emitdumpdata ((UCHAR)LedataOp);
emitsetrecordtype ((UCHAR)LedataOp);
emitsword ((USHORT)w);
ecuroffset += 2;
}
/*** emitcdword - place a constant word into data record
*
* emitcword (w);
*
* Entry w = word
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitcdword (
OFFSET w
){
if (emitcleanq (4))
emitdumpdata ((UCHAR)LedataOp);
emitsetrecordtype ((UCHAR)LedataOp);
emitsword ((USHORT)w);
emitsword (highWord(w));
ecuroffset += 4;
}
/*** emitlong - emit a long constant
*
* emitlong (pdsc);
*
* Entry *pdsc = duprecord
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitlong (
struct duprec FARSYM *pdsc
){
UCHAR *cp;
OFFSET tmpstart;
OFFSET tmpcurr;
OFFSET tmplimit;
tmpstart = pcoffset;
cp = pdsc->duptype.duplong.ldata;
tmplimit = (pcoffset + pdsc->duptype.duplong.llen) - 1;
for (tmpcurr = tmpstart; tmpcurr <= tmplimit; ++tmpcurr) {
pcoffset = tmpcurr;
emitcbyte ((UCHAR)*cp++);
}
pcoffset = tmpstart;
}
VOID PASCAL CODESIZE
emitnop ()
{
errorc(E_NOP);
emitopcode(0x90);
}
/*** emitobject - emit object in dup or iter record to OMF stream
*
* emitobject (pdesc);
*
* Entry *pdesc = parse stack entry
* Global - fInter -> FALSE if in iterated DUP
*/
VOID PASCAL CODESIZE
emitobject (
register struct psop *pso
){
register SHORT i;
if (!pcsegment) {
errorc (E_ENS);
return;
}
mapFixup(pso);
if (fIniter) {
i = LedataOp;
if (wordsize == 4 || pso->fixtype >= F32POINTER)
i |= 1;
emitsetrecordtype ((UCHAR)i);
}
/* Data or DUP record */
if (pso->fixtype == FCONSTANT) {
if (!fIniter) {
if (pso->dsize == 1)
OMFBYTE(pso->doffset);
else if (pso->dsize == 2)
emitsword ((USHORT)pso->doffset);
else
for (i = pso->dsize; i; i--)
OMFBYTE(0);
}
else switch(pso->dsize) {
case 1:
emitcbyte ((UCHAR)pso->doffset);
break;
case 2:
emit2:
emitcword (pso->doffset);
break;
case 4:
emit4:
emitcdword (pso->doffset);
break;
default:
/* the indeterminate case had been set up
by emit2byte as 2. we are now leaving
it as zero and doing the mapping here. */
if (wordsize==4)
goto emit4;
else
goto emit2;
}
}
else
emitfixup (pso);
}
/*** emitfixup - emit fixup data into fixup buffer
*
* emitfixup (pso)
*
* Entry PSO for object
*/
VOID PASCAL CODESIZE
emitfixup (
register struct psop *pso
){
UCHAR fixtype;
USHORT dlen; /* length of operand */
UCHAR flen; /* length of fixup */
SYMBOL FARSYM *pframe;
SYMBOL FARSYM *ptarget;
register USHORT tmp;
SHORT i;
fixtype = fixvalues[pso->fixtype];
emitgetspec (&pframe, &ptarget, pso);
/* magic numbers for omf types. */
dlen = pso->dsize;
if (ptarget){
if ((M_XTERN & ptarget->attr) &&
!pframe && (fixtype == 2 || fixtype == 3))
pframe = ptarget;
}
else
return;
flen = 7;
if (pso->doffset) /* target displacement */
flen += 2 + ((emitrecordtype&1) << 1);
/* make sure that we have enough room in the various buffers */
if (fIniter)
if (emitcleanq ((UCHAR)dlen) || !EFIXOPEN(flen))
emitdumpdata ((UCHAR)(LedataOp +2 - 2 * fIniter)); /* RN */
/* set fixup type--32 or 16 */
if (emitrecordtype&1)
{
if (FixupOp == 0x9C)
errorc(E_PHE); /* is there a better message? */
FixupOp = 0x9D;
}
else
{
if (FixupOp == 0x9D)
errorc(E_PHE); /* is there a better message? */
FixupOp = 0x9C;
}
/* build high byte of location */
tmp = 0x80 + (fixtype << 2);
if (!(M_SHRT & pso->dtype)) /* set 'M' bit */
tmp |= 0x40;
i = (SHORT)(ebufpos - emitbuf - ehoffset);
FIXBYTE(tmp + (i >> 8));
/* build low byte of location */
FIXBYTE(i);
/* output fixup data */
FIXBYTE(efixdat (pframe, ptarget, pso->doffset));
tmp = (pframe->symkind == EQU) ?
pframe->length: pframe->symu.ext.extIndex;
if (tmp >= 0x80)
FIXBYTE((tmp >> 8) + 0x80);
FIXBYTE(tmp);
tmp = (ptarget->symkind == EQU) ?
ptarget->length: ptarget->symu.ext.extIndex;
/* send target spec */
if (tmp >= 0x80)
FIXBYTE((tmp >> 8) + 0x80);
FIXBYTE(tmp);
if (pso->doffset) {
FIXBYTE(pso->doffset);
FIXBYTE((UCHAR)(pso->doffset >> 8));
#ifdef V386
if (FixupOp == 0x9D)
{
FIXBYTE((UCHAR)highWord(pso->doffset));
FIXBYTE((UCHAR)(highWord(pso->doffset) >> 8));
}
#endif
}
ecuroffset += dlen;
/* put zero bytes into data buffer */
while (dlen--)
OMFBYTE(0);
}
/*** mapFixup - map relocatable objects into the correct fixup type
*
*
* Entry *pdesc = parse stack entry
* Returns
* Sets fixtype and dsize
*/
VOID PASCAL CODESIZE
mapFixup (
register struct psop *pso
){
if (fNoMap)
return;
if ((1 << pso->fixtype & (M_FCONSTANT | M_FNONE)) &&
(pso->dsegment || pso->dflag == XTERNAL))
pso->fixtype = FOFFSET;
#ifdef V386
/* Remap OFFSET and POINTERS into there 32 bit types */
if (pso->mode > 4 || pso->dsize > 4 ||
(pso->dsegment && pso->dsegment->symkind == SEGMENT &&
pso->dsegment->symu.segmnt.use32 == 4) ||
pso->dcontext == pFlatGroup && pso->dsize == 4)
switch(pso->fixtype) {
case FOFFSET:
if (pso->dsize != 4)
errorc(E_IIS & ~E_WARN1);
else
pso->fixtype = F32OFFSET;
break;
case FPOINTER:
if (pso->dsize != 6)
errorc(E_IIS & ~E_WARN1);
else
pso->fixtype = F32POINTER;
break;
/* default is to do no mapping */
}
#endif
}
/*** emitgetspec - set frame and target of parse entry
*
* emitgetspec (pframe, ptarget, pdesc);
*
* Entry pframe
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
emitgetspec (
SYMBOL FARSYM * *pframe,
SYMBOL FARSYM * *ptarget,
register struct psop *pso
){
if (pso->fixtype != FCONSTANT &&
pso->dflag == XTERNAL) {
*ptarget = pso->dextptr;
*pframe = pso->dsegment;
#ifndef FEATURE
/* externs without segments and the current assume is to
* flat space get a flat space segment frame */
if (! *pframe && pso->dextptr &&
regsegment[isCodeLabel(pso->dextptr) ? CSSEG: DSSEG] == pFlatGroup)
*pframe = pFlatGroup;
#endif
if (pso->dcontext)
*pframe = pso->dcontext;
}
else {
*ptarget = pso->dsegment; /* containing segment */
*pframe = pso->dcontext; /* context(?) of value */
}
if (!*pframe)
*pframe = *ptarget;
}
/*** efixdat - return fixdat byte
*
* routine (pframe, ptarget, roffset);
*
* Entry *pframe =
* *ptarget =
* roffset =
* Exit
* Returns
* Calls
*/
UCHAR PASCAL CODESIZE
efixdat (
SYMBOL FARSYM *pframe,
SYMBOL FARSYM *ptarget,
OFFSET roffset
){
register UCHAR tmp;
/* build fixdat byte */
tmp = 0;
/* 'F' bit is off */
/* 'T' bit is off */
if (roffset == 0) /* 'P' bit is on */
tmp = 4;
if (pframe)
if (M_XTERN & pframe->attr)
tmp += 2 << 4;
else if (pframe->symkind == GROUP)
tmp += 1 << 4;
/* frame part of fixdat */
if (ptarget)
if (M_XTERN & ptarget->attr)
tmp += 2;
else if (ptarget->symkind == GROUP)
tmp += 1;
return (tmp);
}
/*** edupitem - emit single dup item and count size
*
* edupitem (pdup);
*
* Entry *pdup = dup record
* Exit
* Returns
* Calls
*/
VOID PASCAL CODESIZE
edupitem (
struct duprec FARSYM *pdup
){
register USHORT len;
UCHAR *cp;
if (nestCur > nestMax)
nestMax++;
if (ebufpos - emitbuf != EMITBUFSIZE + 1) {
len = wordsize+2;
if (pdup->dupkind == LONG)
len += pdup->duptype.duplong.llen + 1;
else if (pdup->dupkind == ITEM)
len += pdup->duptype.dupitem.ddata->dsckind.opnd.dsize + 1;
if (!EBUFOPEN(len))
ebufpos = emitbuf + EMITBUFSIZE + 1;
else {
emitsword ((USHORT)(pdup->rptcnt));
/* repeat count */
if (emitrecordtype & 1)
emitsword((USHORT)(pdup->rptcnt >> 16));
/* block count */
emitsword (pdup->itemcnt);
if (pdup->dupkind == LONG) {
cp = pdup->duptype.duplong.ldata;
len = pdup->duptype.duplong.llen;
OMFBYTE(len);
do {
OMFBYTE(*cp++);
} while (--len);
}
else if (pdup->dupkind == ITEM) {
OMFBYTE(pdup->duptype.dupitem.ddata->dsckind.opnd.dsize);
fIniter--;
emitobject (&pdup->duptype.dupitem.ddata->dsckind.opnd);
fIniter++;
}
}
}
}
/*** emitdup - emit dup record and appropriate fixup record
*
* emitdup (pdup);
*
* Entry *pdup = dup record
* Exit
* Returns FALSE if dup is too large to fit in buffer
* Calls
*/
UCHAR PASCAL CODESIZE
emitdup (
struct duprec FARSYM *pdup
){
SHORT op;
op = (f386already) ? 0xA3 : 0xA2;
nestCur = nestMax = 0;
emitdumpdata ((UCHAR)op);
emitsetrecordtype ((UCHAR)op);
/* scan dup tree and emit dup items */
scandup (pdup, edupitem);
if (ebufpos - emitbuf == EMITBUFSIZE + 1) {
ebufpos = emitbuf;
ehoffset = 0;
efixpos = efixbuffer;
return(FALSE);
}
else {
flushbuffer ();
flushfixup ();
emitrecordtype = 0xFF;
}
return (nestMax <= 18);
}
/*** emitEndPass1 - emit end of pass1 info
*
*/
VOID PASCAL emitEndPass1()
{
emitsetrecordtype (0x88);
oEndPass1 = oOMFCur + 5; /* note offset of end of pass1 OMF record */
OMFBYTE(0);
emitsword(0x100 | 0xA2);
flushbuffer ();
}
/*** emitdone - produce end record
*
* emitdone (pdesc);
*
* Entry *pdesc = parse tree entry
* Exit
* Returns
* Calls
*/
VOID PASCAL
emitdone (
DSCREC *pdesc
){
SYMBOL FARSYM *pframe;
SYMBOL FARSYM *ptarget;
OFFSET u;
UCHAR endOMFtype;
flushline();
if (!pdesc)
{
emitsetrecordtype (0x8A); /* RN */
/* emit null entry point marked in MOD TYP */
/* there is a point of contention here. some people
* (and decode.c, old assemblers and other things) say
* the low order bit is zero. others, such as the
* omf documentation, say the low order bit should be
* 1. since I dont know, and am trying to be compatable,
* I will obey the old tools. maybe I'll change this
* later... -Hans
* OMFBYTE(1); /* RN */
OMFBYTE(0);
}
else {
fKillPass1++;
u = pdesc->dsckind.opnd.doffset;
emitgetspec (&pframe, &ptarget, &pdesc->dsckind.opnd);
if (!ptarget || !pframe)
return;
endOMFtype = (cputype & P386)? 0x8B: 0x8A;
if (M_XTERN & ptarget->attr)
pframe = ptarget;
emitsetrecordtype (endOMFtype);
/* emit entry point information */
OMFBYTE(0xC1);
OMFBYTE(efixdat (pframe, ptarget, u) & ~4);
emitsindex (pframe->symu.segmnt.segIndex);
emitsindex (ptarget->symu.segmnt.segIndex);
emitsword((USHORT)u); /* output offset */
#ifdef V386
if (endOMFtype == 0x8B)
emitsword((USHORT)highWord(u));
#endif
}
flushbuffer ();
}
#ifndef M8086OPT
/*** EBYTE - Emit byte macro
*
* EBYTE ( ch )
*
* The bytes are buffered in obj.buf until the buffer fills
* then the buffer is written to disk via edump.
*
*/
#define EBYTE( ch ){\
if( !obj.cnt){\
edump();\
}\
obj.cnt--;\
checksum += *obj.pos++ = (char)ch;\
}
/*** ebuffer - write out object buffer
*
* Writes the record type, record length, record data, and checksum to
* the obj file. This is done via EBYTE which buffers the writes into
* obj.buf.
*
* Modifies obj.cnt, obj.pos, objerr, emitrecordtype
* Exit none
* Returns
* Calls farwrite
*/
VOID CODESIZE
ebuffer (
USHORT rectyp,
UCHAR *bufpos,
UCHAR *buffer
){
register UCHAR checksum;
register i;
USHORT nb;
if ((bufpos != buffer) && objing) {
nb = (USHORT)(bufpos - buffer + 1);
oOMFCur += nb + 3;
checksum = 0;
EBYTE(rectyp)
i = nb & 0xFF;
EBYTE( i )
i = nb >> 8;
EBYTE( i )
while (buffer < bufpos){
EBYTE( *buffer++ )
}
checksum = -checksum;
EBYTE( checksum );
}
emitrecordtype = 0;
}
/*** edump - dump the emit buffer
*
* edump ();
*
* The bytes buffered in obj.buf are dumped to disk. And
* the count and buffer position are reinitialized.
*
* Modifies obj.cnt, obj.pos, objerr
* Exit none
* Returns
* Calls farwrite
*/
VOID CODESIZE
edump()
{
# if defined MSDOS && !defined FLATMODEL
farwrite( obj.fh, obj.buf, (SHORT)(obj.siz - obj.cnt) );
# else
if (_write( obj.fh, obj.buf, obj.siz - obj.cnt )
!= obj.siz - obj.cnt)
objerr = -1;
# endif /* MSDOS */
obj.cnt = obj.siz;
obj.pos = obj.buf;
}
#endif /* M8086OPT */
#if !defined M8086OPT && !defined FLATMODEL
unsigned short _far _pascal DosWrite( unsigned short, unsigned char far *, unsigned short, unsigned short far *);
VOID farwrite( handle, buffer, count )
int handle;
UCHAR FAR * buffer;
SHORT count;
{
USHORT usWritten;
if( DosWrite( handle, buffer, count, &usWritten ) ){
objerr = -1;
}
}
#endif
int emitFpo()
{
struct nameStruct {
SHORT hashval;
char id[20];
} nam = {0, ".debug$F"};
PFPOSTRUCT pFpo = pFpoHead;
SYMBOL sym;
UCHAR comb = 2; // public
UCHAR algn = 5; // relocatable
USHORT tmp = 0;
unsigned long offset = 0;
unsigned long data_offset = 0;
if (!pFpo) {
return TRUE;
}
/*
* write out the externs for all fpo procs
* this must be done during pass1 so that the extdefs
* are written to the omf file before the pubdefs
*/
if (!pass2) {
flushbuffer();
for (pFpo=pFpoHead; pFpo; pFpo=pFpo->next) {
pFpo->extidx = externnum++;
emitsetrecordtype (0x8C);
emitSymbol(pFpo->pSym);
OMFBYTE(0);
flushbuffer();
}
return TRUE;
}
/*
* create the lnames record for the .debug$F section
*/
emitsetrecordtype (0x96);
memset(&sym,0,sizeof(SYMBOL));
sym.nampnt = (NAME*) &nam;
emitSymbol(&sym);
flushbuffer();
/*
* create the segdef record for the .debug$F section
*/
emitsetrecordtype (0x98);
OMFBYTE((algn<<5) + (comb<<2) + 1);
emitoffset(numFpoRecords*sizeof(FPO_DATA), 0);
emitsindex (lnameIndex);
emitsindex (1);
emitsindex (1);
flushbuffer();
/*
* now we have to cruise thru the list of fpo directives and
* fixup any cases where there are multiple fpo directives for
* a single procedure. the procedure size needs to be changed
* to account for the multiple directives.
*/
pFpo=pFpoHead;
flushbuffer();
do {
if ((pFpo->next) && (pFpo->next->pSym == pFpo->pSym)) {
// we must have a group (2 or more) fpo directives
// that are in the same function so lets fix them
do {
pFpo->fpoData.cbProcSize =
pFpo->next->fpoData.ulOffStart - pFpo->fpoData.ulOffStart;
pFpo = pFpo->next;
// now we must output a pubdef and a extdef for the
// fpo record. this is necessary because otherwise the
// linker will resolve the fixups to the first fpo record
// function.
pFpo->extidx = externnum++;
emitsetrecordtype (0x8C);
emitSymbol(pFpo->pSymAlt);
OMFBYTE(0);
flushbuffer();
emitglobal(pFpo->pSymAlt);
} while ((pFpo->next) && (pFpo->next->pSym == pFpo->pSym));
pFpo->fpoData.cbProcSize =
(pFpo->pSym->offset + pFpo->pSym->symu.plabel.proclen) -
pFpo->fpoData.ulOffStart;
}
else {
pFpo->fpoData.cbProcSize = pFpo->pSym->symu.plabel.proclen;
}
pFpo = pFpo->next;
} while (pFpo);
/*
* finally we scan the list of fpo directives and output the
* actual fpo records and associated fixups
*/
for (pFpo=pFpoHead; pFpo; pFpo=pFpo->next) {
/*
* emit the fpo record
*/
emitsetrecordtype (0xA4);
emitsindex (segmentnum);
emitoffset(data_offset,1);
data_offset += sizeof(FPO_DATA);
offset = pFpo->fpoData.ulOffStart;
pFpo->fpoData.ulOffStart = 0;
memcpy((void*)ebufpos, (void*)&pFpo->fpoData, sizeof(FPO_DATA));
ebufpos += sizeof(FPO_DATA);
/*
* emit the fixup record
*/
emitsetrecordtype (0x9D);
OMFBYTE(0xB8); // m=0, loc=14, offset=0
OMFBYTE(0x00); // offset=0
OMFBYTE(0x92); // f=1, frame=1, t=0, p=0, target=2
tmp = pFpo->extidx;
if (tmp >= 0x80) {
OMFBYTE((tmp >> 8) + 0x80);
}
OMFBYTE(tmp);
OMFBYTE(offset);
OMFBYTE(offset >> 8);
OMFBYTE(offset >> 16);
OMFBYTE(offset >> 24);
}
flushbuffer();
lnameIndex++;
segmentnum++;
return TRUE;
}
Reference in a new issue Copy permalink